In this paper, a novel 15 level symmetric switched capacitor multilevel inverter (SCMLI) structure is proposed first. The structure is developed by using 3 non-isolated DC power sources. The capacitors utilized in the structure can be charged to the summation of all the power supplies by turning ON the minimum number of switching devices. After that a generalized structure of the proposed SCMLI is developed. The voltage and current stresses for different switches of the proposed general structure are discussed. The selection procedure of switched capacitors for the proposed 15 level inverter is presented for resistive and resistive-inductive load conditions. A detailed comparison study of the proposed structure with other recently developed structures shows that the proposed structure requires reduced number of components and the number of switches in the conducting path as compared to other SCMLI structures for generating an output voltage level. Further, the overall cost of the proposed and suggested topologies has been compared based on a cost function (CF). It has been observed that the proposed structure is more cost effective as compared to others. An extensive experimental study conducted on a 15 level SCMLI laboratory prototype proves the effectiveness and merits of the proposed structure.

本文首先提出了一种新颖的15级对称开关电容多电平逆变器（SCMLI）结构。该结构是通过使用3个非隔离式DC电源开发的。通过接通最小数量的开关器件，可以将结构中使用的电容器充电到所有电源的总和。之后，开发了提出的SCMLI的通用结构。讨论了所提出的一般结构的不同开关的电压和电流应力。提出了针对拟议的15级逆变器的开关电容器的选择程序，针对电阻性和电阻性感性负载条件。对所提出的结构与最近开发的其他结构的详细比较研究表明，与产生输出电压电平的其他SCMLI结构相比，所提出的结构需要减少的组件数量和导电路径中的开关数量。此外，已根据成本函数比较了建议拓扑和建议拓扑的总体成本（CF）。已经观察到，与其他结构相比，所提出的结构更具成本效益。在15级SCMLI实验室原型上进行的广泛实验研究证明了该结构的有效性和优点。